Free 2D pixel-art / indie game dev calculator. Enter frame size, frame count, frame rate, and bit depth; outputs optimal sprite-sheet grid, total animation duration, and uncompressed VRAM footprint.
Built and maintained by Paul Clark, Redmoon Software
Use before exporting from Aseprite, Photoshop, or Krita. Catches VRAM problems before they show up as crashes on mobile.
Unity's sprite packer reports final sizes after import; this tool predicts them before.
8 frames at 32×32 pack into a 96×96 sheet (3 cols × 3 rows).
For N frames at W×H pixels, the calculator finds the grid (cols × rows) whose total sheet is closest to square — a GPU-friendly layout.
VRAM footprint = sheet width × sheet height × (bit depth ÷ 8). It assumes uncompressed RGBA by default.
Animation duration = frame count ÷ FPS.
No — the grid assumes packed frames. Add 1–2 px of bleed manually in your sprite tool to avoid sampling artifacts.
GPU-friendly: power-of-two dimensions when possible. The grid finder targets near-square sheets.
It multiplies the total pixel count of every frame by the bytes per pixel implied by your bit depth; for example, 32-bit RGBA uses 4 bytes per pixel. The result is uncompressed memory, so on-disk PNG files will be much smaller.
Higher bit depth stores more color and alpha detail per pixel but doubles or quadruples memory use compared with indexed or 16-bit formats. For pixel art a lower bit depth or indexed palette can cut VRAM dramatically with little visible loss.
Input
32×32, 8 frames, 12 FPS, RGBA 32-bit.
Output
Sheet: 128×64 (4 cols × 2 rows). Duration: 0.67 s. VRAM: 32 KB.
Square-ish grid pack: 4 columns × 2 rows = 8 frames in a 128×64 sheet. 128 × 64 × 4 bytes = 32,768 bytes = 32 KB uncompressed.
The layout is frames times frame size, arranged into a grid — the defaults build eight 32×32 frames at 12 fps. Memory follows from pixel count times bit depth, so a 32-bit sheet costs four bytes per pixel regardless of what the art looks like.
Padding textures to powers of two used to be mandatory and is now mostly a habit. Modern hardware handles arbitrary sizes, though power-of-two dimensions still matter for mipmapping and for some compressed formats, so it remains a reasonable default rather than a rule.
The artefact that catches people is edge bleeding: at non-integer scales or with filtering enabled, a sampler reads a fraction of the neighbouring frame and a thin line of the wrong colour appears along the sprite edge. The fix is padding between frames with the edge pixels extended into it, which costs sheet area and is far easier to plan for than to retrofit.
Twelve frames per second is the traditional animation rate and does not divide evenly into a 60 Hz display, so frames are held for unequal numbers of refreshes. That is usually invisible, but if animation looks subtly uneven, an fps that divides the refresh rate — 10, 12, 15, 20, 30 — is worth trying.
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